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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f666adc5209cd9905530d9365f21244992fa52c639ebed86be576c8f67e6644' 
  AND token = '4PJ4nL+XMU/Axhy6Kf6s0I2lnnx4cAyFDrUy7fx/gig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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