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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ecebef14d34b8e230f90e8040b7023d230c19248e297d57b031f305610a15f' 
  AND token = 'B9u+mSEnZ5t2DXWL6R0hirBBWPbyd9DmqJ63YQxC2tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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