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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299d3d920e8810f67c1196120ea224fc3a00e220dc1f7859864bc985234cfb8a' 
  AND token = 'U3F9enng47keXComSuUiq+y/+Q7kBFlQChfWgTxxGSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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