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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8706bba31371acfe45c537d7e8812d27cc53e14b7f8e6ff9c0251661351540c1' 
  AND token = 'PsF7KVSqMOUEui+kdgmqlIfNjyQT4EZsCgM0RMRmOEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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