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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d03e22e1c75fc8ea2a3619aeda04f6bd9d24bccb784c8a2330a03b0416fcd4' 
  AND token = 'rvejflguMH4VVjAclsCbZkTZYQnz9VhNlqfrPAIK6Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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