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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2421f2662e47836f12d47f61ab6533572a391d61f97a17c3fb43e42f51ea95' 
  AND token = 'xzJ2nCcZ8R1whPog6zMfv73I3iTzajnf6Kt9oA3or94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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