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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9feeb9bf3fe7d72c0c12ee0794285e393702b1c51b41fd3bab3f5c6bf60f02ce' 
  AND token = 'j3A5ZSuBNbMu8BBASu+86QxwdLqzXFtAWyONj6PHdls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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