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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee36ab382479c00989b0eab7283cc90791803ed8ca99adc4cd68ae3b3527c995' 
  AND token = '/OxJLhQUI57sKUhpgVSSRTPfNAoXdLT15zuQEb7AkBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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