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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f566ab3cbc1ade51e99fbddba5af11ca574534f25e893255ae2a6a89e426fcc' 
  AND token = 'oLy2VsLyc6vOW4op8JlggjEeYvUgp+EdIun/krsjyE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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