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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6003826bd2ad93a801c1e7384da29260584f2ff10eed0795218d65d23dfb99' 
  AND token = '+3u33OptO8PlczPz9ng6yYN6oSCvNH9ChSUjxs4u9qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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