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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d83d98a9ccf40ebadc8aeb5d7c6103dcc95a65cde73f870fcc9fad80306d2b7' 
  AND token = '7Ii8iUfYwWsLdht2A51kP5v9AWLlu0yuxFq1cZxQkiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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