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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3b86fbf4d9ba17dda46b5dc6d1e51214df03003a08e2160b34343f316291bc' 
  AND token = '+0q1xNsvXA2c5Oo6f1bh/WVDdaVS/j5PWCj1EPqFEgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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