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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f67fcf0676a76051188c481235810fc1ec027a423f0d9902d6bf69241dd8c2' 
  AND token = 'vBLrJ91y9q6LnxfQ8zZdc7XjI3KTyJf410rewSuZZQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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