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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea5974b95571150662c5e34ca356d61b3068c2d8450dd230c302877645f231a' 
  AND token = 'Mgmn7z3e4v6Rz0yQtASFNEtqCs91PRDozkfP2wjNMUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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