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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d17e266c6e6890213df4d14b08218008ab82afdd3524f9f2b3e03cb3848e7b7' 
  AND token = 'fZYUT56QFmv2MkWLsLvGnEa8uokKm1WgSksPyZfx+qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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