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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85aa5986d17c17fc890ea12fbec233fe7f0d6aaed969efb2c87ebf86f8454b03' 
  AND token = 'oHmothTxq4naoTHIu9wPin/r16k+YzZOUaAPS1W60UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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