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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b9ffc5a59e6953a62bf28ac8ed58c3c261ef2fcd63ac60a503459b93e4870d' 
  AND token = 'TZ3hdh0ni1TuiOd7eqy3vi5GYL+Nul71Q8nfCmYSHgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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