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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7b096dae205b6e222470f17d28ad1be3c79be89f38ca2e8f36ee4e75b8bf84' 
  AND token = 'sVBRwZ0xk2alRv2EvjNSbGDocCu2nbeO8KhqHDiWUnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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