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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c78f8f6c22825eeb46c3deaafeeb5658238e8d2e31d768ea44bc37675ac655' 
  AND token = 'UZBh2T6JuMBItIKp2OKXaRGEymxRvSVbijvzbsduNwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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