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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7c4aad6101e8a5d0cbb416b907d840cdee810724b131397f2299183111e057' 
  AND token = '7bkod13OJP4P2JpspLPEZWX2Rfzgf/vS21pjCNhek+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}