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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7c8aa0468c1c73883b2a5548b5ebe7e91fa404bc0cc78b1818cc1c0d6fb4e8' 
  AND token = 'qOZ+Ji93hB0ch9C5zN+03enrhcbCsSi0QI0o2B+GMwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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