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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603c63d8885ed9b4b3275ed6b57c3e13c733c7f8c875a1645917227d7e48c159' 
  AND token = 'DoAKP84A+x4JProC8hOO5LM4zeaLeKTMhVu6LuuRKTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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