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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e2f6d461410e7dff932dc80bbefa7cfb8241192e6b9d923f05162f46f774b9' 
  AND token = 'THH9DmCZJq0WgI716Kc1mRSjRL4HCzfxdPTKq9TUTD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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