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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e92559474ae5de0085f969b5df69f05087a5b3ef2cda70697b1ed7a1e248bb4' 
  AND token = 'hBrOFjkSsW6RhAee58yt+JDzvli4+S/23wYRLTio5/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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