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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35215eac3a4b3f542d7f1a9aaa5b60b77850ce47a8eb4476f8ed13d600555ab4' 
  AND token = 'wGuF2EUp7Xu+rEAtbXTyVyUCAUhSup5kRjVbEw4A/zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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