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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7940a74f5365c6df4257f8a98ec6c72cd5bc44a8590ef81f6255a6a70922354f' 
  AND token = 'lEInpHCQlk2f3RNh40peN5rxKgOBXGXQLCIOXV75vEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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