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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dc5e977ecfc2fbbfd5232967fa401018f87eb54db5c4850d02a3aed0551847' 
  AND token = 'KG4nQJZTyV3uw54+In8yDE36adejMt3tpwZJj9D1AKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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