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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3985ce64109ae0ad4f360ffcbf4b4ef0f8a0bebf1794bd7627a02e4f5c6a6cdf' 
  AND token = 'tKxDyE/RbPrUK8y/2HpFx4kNogXIagF6UWAtnx4vYQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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