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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604fb24ea36161b79919605dd79d6896583d207c4aa6b37640dcb19a1f0d3c5b' 
  AND token = 'KokcstM3rosmJLN/Vj+J/hQz1iMPb5NWPF0P94THAN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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