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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73efe54cabaa72526251db488159507a860eb18bf5d705c5843536b07d469244' 
  AND token = 'Rebd9sNfulWETJ0/vfjYI7/nCFah7lLZfJ1MX5nohT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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