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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b213867030962635b1979aa7223dcca52df40ef8ca332d13e06939594d607059' 
  AND token = '6+u5iAj3Nz8Gg5p6Kz9STNRuWlAv4+9itc6A8uwXq6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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