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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beff1a9b9620bd97ce25c64a2ba56712a144bf2012bb5f9fa670827661a5d676' 
  AND token = '5CY5b7St9t0tDxfQwJjoosMWKVQX4GfDTR3mW9iaWh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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