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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587896f03ed5c1c82ff2757242bce3511ad8c48929aec6db93595b70c4d35936' 
  AND token = 'TixbXtxCcfmsgNcWg9VD7064X3iPcX454Eujo75VFBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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