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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaff2f0202d51c1034ce3db0eb95db4d645dab0a07828216b3e777a6b3aac68' 
  AND token = '8/rbmArkhU4TWNezOXpYH5PTWjYntNN9XybjS/DG5uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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