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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04f38b2da6f1947772f8990d0b35ddaea211bea02631f76d65c123e2c98d424' 
  AND token = 'JPd9zy7Rb0UMKnltxsgX3dNTB0bZsge/EKv1l81lT0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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