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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502a78ae3f06d3ac1b10227d3675bdb7bc3a022eb5693ac13b05e02e1a53510d' 
  AND token = 'EBQYvAvOQ1Fyh4qfFIvVppxGNnmMpKpW5lHivDRFHnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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