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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59664ed19d3a7bc22d9a6fbd61daa091eec4380c4a632ab215675dae59a4bb0' 
  AND token = '0aF488oPXRV04Ay4tycI1202LRvP8wwPAGkf0Hm+iGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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