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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423d55e4b2c32e9c2990d60e18345850edb8f76a804e46774ee7fcbfbe2d9587' 
  AND token = 'MScvcEbZYqiZNl/5WRWqueaoI/tM4MoRlyhn1tYC0+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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