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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb33147ce1ae09d8a90371fab2c8c599dd2a2d7b69e476bffad5a94c0c637c87' 
  AND token = 'n4+e22uK8wCNNlGsXRlz3qR4bCr28HCFIraLKn7mBlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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