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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69794a249cfcf4fa2982b53361cea51d9e6b94760d5f72600eca1c095516d4e9' 
  AND token = 'o+qlYo4gFZoC1JLc2suwku2D2u6gJ5+QIFWi65kue5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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