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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6907c9fac040c5d0e4d0b41a81425aa96573633e767a14d71e6ad21593de1b6d' 
  AND token = '4DhnontHAUtZ0zTFl9B7ZxAEm73sQh54kVeP9580hvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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