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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030c75d76f12d036d3656552d32a7bd2b99ee60336ebb710f35c7f7bdb7414c2' 
  AND token = 'Cu2vd+Y1zjpsW2tAsCf2yIIwewIlT+izPCsrCNMx4LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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