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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf2259c7209ea558ec1a75e89c8792b7bdbfb33d6d7cd7c8532a640ac7b7b89' 
  AND token = '6SFV+a4IaJopYmsQX2AU8b2UVQQrxXdo5j7/xhQJUEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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