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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21abb2f44f23bdcc4fc5206619daf4dad9fbdcc0c4d02a4806a22e0424658e51' 
  AND token = 'ia6eaWzp/HxlPNhn/il6V2+GsAM0nU4YLVZblCVs/ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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