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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de27354e22c8b3c93c04bc7661b5c39473e67f0b7e165ad73df7301e7e26d58' 
  AND token = 'Z9NYwQMU7302yFuFrpxIkTXiq2LjX4LCJUgddCrGKeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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