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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b38f7ce6cfc3efa72f27a0a9b93cbc1e92c9b3e5e5e2a579350310f46d280f' 
  AND token = 'PqRdACNE6bSMMhpa+3wenx6Yh4+NxP9bFtl/esDgKFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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