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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66965a69ab89230a29f5ea6a3d466caf6848730a790bba2b83999697fa8296bb' 
  AND token = 'GzE6TVECtqPt4Ygs/8QWtASie3cP2rVCt9kY8R78NEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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