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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ec5b74431852a5dd4c14aea709dcce4050b7051eb25a1796a34bfb28c77fd9' 
  AND token = 'aP8E2YuRbkJBS1m+MAGPT2/mB5Khl/NLNcuojFgQMzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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