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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6795753c909795fd780079a313fc9d5cbd9b3de22ff0c1dfd8e7a74fb836bb9b' 
  AND token = '1UQjVxLptRENZLwPg91cryeoNWk65acD2HpuHgrk0w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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