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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b07b55f75ca7e5089f213d0b421be73e459efb71d2d6e5870ac0564806fe691' 
  AND token = 'EcgA4I8AulJsGuyaYHKK4EXeczaNLdKnaDH6rvplEC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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