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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcc3317af1d052b39e3ceb931a041c1f156a0805a194f53b9a5941cf0f12666' 
  AND token = 'y6o4DtVqTFI7lMyBlKTi9PYO+uFczNg3g147EkJaTHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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