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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059b0a1c0784fccc209ce2607c1d2c27873af9effab40ec097ad99c79706cc3d' 
  AND token = 'A/v9u+DMph7JKrtp/OFi0tO1PZmn+FPpNtQu0B+UCi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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