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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81861801837e0cda11ff4ed6a90f6f66aada9f069e72e69ff61fa0f786d71011' 
  AND token = 'Y0cS4VW7F15UPXvy5fgREO+82DWrFXaoHUxhc2cn7n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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