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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989fd97d11bc7ab227832e614b0da13abb0ad8396434ab04d7901177597e81d7' 
  AND token = 'hxAoh/815YJEY/CYupW3i1nnyg8lQG32mbZ/3st2iUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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