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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e1c696e132316b282f9659059f37ad478d98428644ed403c6d22b34cb25a65' 
  AND token = 'Mk+t0DYAykvCpeOATP1GDqvPbvXQkZM6UScylCKNRJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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