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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7d1551770e474bf5b78c5a9504cff87c0b901ae42c1bd000f0706a1f08f982' 
  AND token = 'sLX3LfUisHNF4PRhSt/4r28kY5U394NcceEsNDv20c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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