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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfe4938e2d687b477c510a3925b9fb7ae0febec4d710f1f25c8a90213d4f90d' 
  AND token = 'EkvohsWWcYCGgxWfJGY13CKRI36A8HfJB6zRchDibiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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