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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aac193a24971ebd6bf6323cba7b5a7fcc138ac3f7c8a7e0ae56917abec7f0c1' 
  AND token = 'qQyVQ7ndRq200d0LPz0JCdr7ClaC1BG2mE7Pv7o6iw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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